Other than that, I would probably be desperately trying to come up with some means of maximizing my chances of survival, while constantly being distracted by the interesting ways in which other people on board with me were reacting to our predicament and trying not to dwell on the ramifications.

Next thought: Dear God, I don't know if you exist or not but if you do, please spare us.

Followed by:
Assuming I'll die, there's a very quick play by play of key moments in my life and loved ones. Tell my family I love them and say final goodbyes.
Pray that my death if I must die will be quick and painless.

I'm a Christian ENTP. My first thought would be "Wow, what a ride!" followed by "I didn't get done all the stuff I wanted to try" followed by "Next stop afterlife... Wonder what that'll be like? ...Here I go!!!"